Spark-arrester



(No Model.)

L. O. MABIE.

SPARK ARRBSTER.

Patented June 8, 1 890.

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UNITED STATES PATENT OFFICE.

LANGFORD C. MABIE, OF RICHMOND, VIRGINIA.

SPARK-AR RESTER.

SPECIFICATION forming part'of Letters Patent No. 429,138, dated June 3,1890.

Application filed February 18, 1890- Serial No. 340,846. (No model.)

To all whom it may concern:

Be it known that I, LANGFORD C. MABIE, of Richmond,in the county ofHenrico and State of Virginia, have invented certain new and usefulImprovements in Spark-Arresters; and I do hereby declare the followingto be a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, forming a part of this specification,and to the letters of reference marked thereon.

This invention has for its object to provide a spark-arrester which willeffectually arrest and prevent the passage of any sparks or other solidmattersuch as cinders from a locomotive smoke-stack, and at the sametime to leave a perfectly free and open passage for the air, steam, andother gaseous products, thereby enabling the maximum draft to beobtained.

To these ends the invention'consists in certain novel details ofconstruction and combinations and arrangements of parts, to be hereinafter described, and pointed out particularly in the claims at the endof this specification.

Referring to the accompanying drawings, Figure 1 is a sectional Viewthrough the front end of a boiler and smoke-stack constructed inaccordance with my invention. Fig. 2 is a front elevation showing thecinder-box with the stack partially broken away to show thecinder-conduit. Fig. 3 is a top view of the stack with the deflector orupper diaphragm removed. Fig. 4 is an enlarged section of the top of thestack.

Similar letters of reference in all the figures denote the same parts.

A, Figs. 1 and 2, is the boiler, which may be of any preferred type,either with or without an extension-front, and on top of the same issecured by bolts or otherwise a cast iron smokestack B, preferablytapering from top to bottom, as shown. Within the stack B is a second orinner stack 0, of somewhat smaller diameter, held in place byspacing-bolts 0,10- cated at the top and bottom, or elsewhere, ifnecessary, with a space of three or four inches between the two shellsor stacks. The top of the inner stack 0 is closed by a concavo-convextop or diaphragm D, having a series of apertures therein, in which arelocated short tubular sections D, preferably about three and one-halfinches in diameter,and which extend about four inches above the surfaceof top D, the whole top and tubular extensions being preferably cast inone integral piece. The outer stack is provided with a cover orconcavo-convex diaphragm B, preferably held on a seat I) about eightinches from the top D, and is provided with apertures and tubularprojections about four inches in diameter and length, which extensionsproject downward, and it will be seen, therefore, that the ends of thetwo sets of extensions are in substantially the same plane. Theextensions of the lower diaphragm are so located with reference to thosein the upper diaphragm as to break joints, so to speak, or so that anysparks, cinders, or other solid matter passing through them will notenter the upper extensions, but will strike the under surface of thediaphragm and drop back on top of the lower diaphragm, sliding thencedown over the convex surface into the space between the two stacks.

In order, now, to provide a means for removing the solid matter socaught, the space between the two stacks is converted into a passage-wayby means of partitions E, starting from a point in rear of the stack atthe top and extending diagonally around and ending in a pipe E at thebottom, which leads to a suitable receptacle or box F, preferablylocated below the boiler and provided with a hopper-bottom with a door Fopening outward at the bottom of the hopper portion, whereby the entirebox may be emptied by opening the door. The door is operated from thecab by means of a rod and bell-crank lever F bearing against the door,as shown.

The operation of this portion of the invention will now bereadilyunderstood, the products of combustion, sparks, cinders, 850.,drawn through the stack by means of the exhaust, as usual, are allcarried up the inner stack and readily find the apertures in the lowerdiaphragm by reason of its curved surface, and on passing through themthe solid particles are projected straight-forward until they strike theunder surface of the upper diaphragm and drop back onto the convex topof the lower diaphragm, sliding thence down into the chute, and thenceinto the receptacle, the gaseous products meanwhile passing readily fromone set of tubular extensions to the other and into the open air. Thespace into which the solid particles fall, it will be observed, iscomparatively undisturbed by the escaping gases, and hence there islittle or no liability of the sparks being carried out the top of thestack.

A pipe G communicates with the receptacle F and with the boiler or tank,whereby the engineer may easily extinguish any sparks and dampen thecollected cinders, as will be readily understood. The inner stack, itwill be observed, is tapered from the top to the bottom or flaredupward, thus assisting the draft, as the exhaust expanding in the samewill tend to move upward. 7

Having thus described my invention, whatI claim as new is- 1. In aspark-arrester, the combination,with the flue or stack for the productsof combustion from the furnace, of two diaphragms interposed in saidfine and having apertures therein, with tubular extensions in eachdiaphragm, said extensions projecting toward each other or each into thespace between the diaphragins, substantially as described.

2. In aspark-arrester, the combination,with the line or stack for theproducts of coinbustion from the furnace, of two concave-convexdiaphragms interposed in said fine and having apertures with tubularextensions in each diaphragm, said extensions projecting toward eachother or into the space between the diaphragms, substantially asdescribed.

In a spark-arrester, the combinatiomwith the fine or stack for theproducts of co1nbnstion from the furnace, of a concavo-convex diaphragminterposed in said line and having apertures therein, withupwardly-projecting tubular extensions therein, and a second diaphragminterposed in said flue above the first diaphragm and having aperturestherein of greater diameter than those in the lower diaphragm, withtubular extensions projecting downward, substantially as described.

4. In a spark-arrester, the combin ation,with the boiler, smoke-box, andstack, of the two concavo-eonvex diaphragms in the top of the stack,each having apertures therein, with tubular extensions projecting intothe space between the diaphragnis and the conduit leading from the lowerportion of the bottom diaphragm to a receptacle for the cinders,substantially as described.

5. The con1bination,with the smoke-box and stack secured thereon, havinga diaphragm therein, with perforations therein, havingdownwardly-projeeting tubular projections, of an inner stack having adiaphragm at the upper end with perforations and upward tubularextensions, and a diagonal partition between the two stacks, whereby aflue is formed for conveying the cinders and ashes out of the spacebetween the diaphragms, substantially as described.

LANGFORD C. MARIE.

\Vitnesses:

Z. I BURNETT, L. B. SOHERER.

